Lubricating oil additives
Additives for n-paraffin-containing lubricating oils, which additives are mixtures of acrylates containing(I) from 10 to 99 weight percent of polymers P.sub.1 composed of(a) esters of methacrylic acid and/or acrylic acid and linear C.sub.6 to C.sub.15 alcohols;(b) esters of methacrylic acid and/or acrylic acid and linear C.sub.16 to C.sub.30 alcohols;(c) esters of methacrylic acid and/or acrylic acid and branched C.sub.8 to C.sub.40 alcohols;(d) esters of methacrylic acid and/or acrylic acid and C.sub.1 to C.sub.5 alcohols; and(e) monomers having functional groups, the amount of (b) being at the most 5 mol percent; and(II) from 90 to 1 weight percent of polymers P.sub.2 composed of(a') esters of methacrylic acid and/or acrylic acid and linear C.sub.6 to C.sub.15 alcohols;(b') esters of methacrylic acid and/or acrylic acid and linear C.sub.16 to C.sub.30 alcohols;(c') esters of methacrylic acid and/or acrylic acid and branched C.sub.8 to C.sub.40 alcohols;(d') esters of methacrylic acid and/or acrylic acid and C.sub.1 to C.sub.5 alcohols; and(e') monomers having functional groups, the amount of (b') being between 10 and 70 mol percent; and a solvent therefor.
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1 13? -? ? = 4.9? -43? -19? -
.sup.1 Pour Point = -11.degree. C. -
.sup.2 Pour Point = -5.degree. C. -
These examples show that the mixtures in accordance with the invention (Examples 1 to 7) yield better pour point values in both base oils tested than do the prior art additives or additive mixtures (Comparative Examples 1 to 16).
Claims
1. An additive for a lubricating oil containing an n-paraffin, said additive comprising from 20 to 90 percent by weight of a solvent, the balance being a mixture comprising 10-99 percent, by weight of said mixture, of a first polymer component (I) which is at least binary, and from 90-1 percent, by weight of said mixture, of a second polymer component (II),
- said first polymer component comprising:
- (I) (a) 10-98 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a linear alcohol having 6-15 carbon atoms;
- (I)(b) 0-5 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a linear alcohol having 16-30 carbon atoms;
- (I)(c) 0-90 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a branched alcohol having 8-40 carbon atoms;
- (I)(d) 0-50 mol percent therein of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and an alcohol having 1-5 carbon atoms; and
- (I)(e) 2-20 mol percent of a monomer capable of free radical polymerization, different from monomers (I)(a)-(I)(d), and having at least one functional group in the molecule, said monomer being selected from the group consisting of compounds of the formula
- said second polymer component comprising:
- (II)(a') 0-90 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a linear alcohol having 6-15 carbon atoms;
- (II)(b') 10-70 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a linear alcohol having 16-30 carbon atoms;
- (II)(c') 0-90 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and a branched alcohol having 8-40 carbon atoms;
- (II)(d') 0-50 mol percent of an ester formed between at least one member selected from the group consisting of methacrylic acid and acrylic acid and an alcohol having 1-5 carbon atoms; and
- (II)(e') 0-20 mol percent of a monomer capable of free radical polymerization, different from monomers (II)(a')-(II)(d'), and having a functional group in its molecule.
2. An additive as in claim 1 which additionally comprises up to 70 percent, by weight of said additive, of at least one member selected from the group consisting of VI-improving olefin copolymers and hydrogenated styrene-diene copolymers.
3. An additive as in claim 2 wherein said solvent is a good solvent for polymer components (I) and (II), a less good solvent for said olefin copolymers by virtue of the polymer components (I) and (II) dissolved therein, and which additionally comprises a stabilizer which is a block or graft copolymer, A-Y, wherein A comprises olefinic monomers and Y comprises acrylate ester and methacrylate ester monomers.
4. An additive as in claim 2 wherein said mixture including polymer components (I) and (II) and said member is from 20 to 80 percent by weight of said component.
5. An additive as in claim 1 wherein polymer component (I)(a) is at least 50 mol percent of said component.
6. An additive as in claim 1 wherein polymer component (I)(a) is 100 mol percent by said component.
7. An additive as in claim 1 wherein polymer component (II)(b') is 20-40 mol percent by weight of said component.
8. An additive as in claim 1 wherein at least one of polymer components (I)(a) and (II)(a') is an ester formed from a linear alcohol having 10-14 carbon atoms.
9. An additive as in claim 1 wherein at least one of polymer components (I)(b) and (II)(b') is an ester formed from a linear alcohol having 16-24 carbon atoms.
10. An additive as in claim 1 wherein at least one of polymer components (I)(c) and (II)(c') is an ester formed from a branched alcohol having 18-22 carbon atoms
11. An additive as in claim 1 wherein at least one of polymer components (I)(c) and (II)(c') is formed from a branched alcohol having 8-20 carbon atoms.
12. An additive as in claim 1 wherein at least one of polymer components (I)(c) and (II)(c') is formed from at least one branched alcohol selected from the group consisting of iso-C.sub.10, iso-C.sub.13, and iso-C.sub.18 alcohols.
13. An oil, containing an n-paraffin which is a member selected from the group consisting of motor lubricating oils and automatic transmission fluid oils and comprising therein 1-10 percent by weight of an additive as in claim 1.
14. An oil, containing an n-paraffin, which is a member selected from the group consisting of hydraulic oils and gear oils and comprising therein 5-30 percent by weight of an additive as in claim 1.
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- Morawetz, "Macromolecules in Solution", vol. XXI of High Polymers, Interscience Publishers, (1965), pp. 85-89.
Type: Grant
Filed: Dec 27, 1988
Date of Patent: Nov 6, 1990
Assignee: Rohm GmbH (Darmstadt)
Inventors: Helmut Knoell (Lantertal), Ulrich Schoedel (Rossdorf), Horst Pennewiss (Darmstadt), Heinz Jost (Modautal)
Primary Examiner: Margaret B. Medley
Law Firm: Curtis, Morris & Safford
Application Number: 7/291,387
International Classification: C10M14514;